sort-cli: init

sort-cli/go.mod

@@ -0,0 +1,14 @@
+module sort-cli
+
+go 1.21.6
+
+require (
+	github.com/stretchr/testify v1.8.4
+	golang.org/x/exp v0.0.0-20240112132812-db7319d0e0e3
+)
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

sort-cli/go.sum

@@ -0,0 +1,12 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+golang.org/x/exp v0.0.0-20240112132812-db7319d0e0e3 h1:hNQpMuAJe5CtcUqCXaWga3FHu+kQvCqcsoVaQgSV60o=
+golang.org/x/exp v0.0.0-20240112132812-db7319d0e0e3/go.mod h1:idGWGoKP1toJGkd5/ig9ZLuPcZBC3ewk7SzmH0uou08=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

sort-cli/main.go

@@ -0,0 +1,211 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"golang.org/x/exp/maps"
+	"io"
+	"log"
+	"os"
+	"sort"
+	"strings"
+)
+
+type Cfg struct {
+	Key     int
+	Numeric bool
+	Reverse bool
+	Unique  bool
+}
+
+func main() {
+	fmt.Print(run())
+
+	os.Exit(0)
+}
+
+func run() string {
+	var c Cfg
+
+	flag.IntVar(&c.Key, "k", 0, "sort via column")
+	flag.BoolVar(&c.Numeric, "n", false, "compare according to string numerical value")
+	flag.BoolVar(&c.Reverse, "r", false, "reverse the result of comparisons")
+	flag.BoolVar(&c.Unique, "u", false, "output only the first of an equal run")
+
+	flag.Parse()
+
+	return doSort(&c, flag.Args())
+}
+
+func doSort(cfg *Cfg, sources []string) string {
+	r := splitLines(load(sources), []byte("\n"), cfg.Key)
+
+	if cfg.Unique {
+		r = uniques(r)
+	}
+
+	rs := &Rows{s: r, cfg: cfg}
+	sort.Sort(rs)
+
+	return rs.String()
+}
+
+type Row struct {
+	Line   []byte
+	Column []byte
+}
+
+type Rows struct {
+	s   []*Row
+	cfg *Cfg
+}
+
+func (p *Rows) Len() int { return len(p.s) }
+func (p *Rows) Less(i, j int) bool {
+	s := p.s
+
+	lr := s[i]
+	rr := s[j]
+
+	if p.cfg.Reverse {
+		lr, rr = rr, lr
+	}
+
+	var l, r []rune
+
+	if p.cfg.Key == 0 {
+		l, r = bytes.Runes(lr.Line), bytes.Runes(rr.Line)
+	} else {
+		l, r = bytes.Runes(lr.Column), bytes.Runes(rr.Column)
+	}
+
+	ln := len(l)
+	rn := len(r)
+
+	for i := 0; i < min(ln, rn); i++ {
+		if l[i] == r[i] {
+			continue
+		}
+
+		return l[i] < r[i]
+	}
+
+	return ln < rn
+}
+
+func (p *Rows) Swap(i, j int) {
+	s := p.s
+
+	s[i], s[j] = s[j], s[i]
+}
+
+func (p *Rows) String() string {
+	r := p.s
+
+	var n int
+	for _, s := range r {
+		n += len(s.Line)
+	}
+	n += len(r) * len("\n")
+
+	var sb strings.Builder
+	sb.Grow(n)
+
+	for _, c := range r {
+		for _, rn := range c.Line {
+			sb.WriteByte(rn)
+		}
+
+		sb.WriteString("\n")
+	}
+
+	return sb.String()
+}
+
+func load(sources []string) []byte {
+	if len(sources) == 0 {
+		return loadStdin()
+	}
+
+	inputs := make([][]byte, 0, len(sources))
+	for _, path := range sources {
+		if path == "-" {
+			inputs = append(inputs, loadStdin())
+
+			continue
+		}
+
+		inputs = append(inputs, loadFile(path))
+	}
+
+	var totalSize int
+	for _, s := range inputs {
+		totalSize += len(s)
+	}
+
+	var b bytes.Buffer
+	b.Grow(totalSize)
+
+	for _, c := range inputs {
+		b.Write(c)
+	}
+
+	return b.Bytes()
+}
+
+func loadStdin() []byte {
+	b, err := io.ReadAll(os.Stdin)
+	if err != nil {
+		log.Fatalf("can't read stdin: %e", err)
+	}
+
+	return b
+}
+
+func loadFile(path string) []byte {
+	if _, err := os.Stat(path); err != nil {
+		log.Fatalf("file not exists: %s", path)
+	}
+
+	content, err := os.ReadFile(path)
+	if err != nil {
+		log.Fatalf("file open file: %s", err)
+	}
+
+	return content
+}
+
+func splitLines(b, sp []byte, key int) []*Row {
+	r := make([]*Row, 0, bytes.Count(b, sp))
+	for _, b := range bytes.Split(b, sp) {
+		var column []byte
+
+		if key != 0 {
+			bs := bytes.Split(b, []byte(" "))
+
+			if len(bs) < key {
+				continue // TODO is it error or not?
+				// log.Fatalf("Column for key \"%d\" doesn't exists", cfg.Key)
+			}
+
+			column = bs[key-1]
+		}
+
+		r = append(r, &Row{Line: b, Column: column})
+	}
+
+	return r
+}
+
+func uniques(r []*Row) []*Row {
+	m := make(map[string]*Row, len(r))
+
+	for _, r := range r {
+		r := r
+
+		m[string(r.Line)] = r
+	}
+
+	return maps.Values(m)
+}

sort-cli/main_test.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"flag"
+	"github.com/stretchr/testify/assert"
+	"os"
+	"strings"
+	"testing"
+)
+
+func TestFlags(t *testing.T) {
+	// We manipulate the Args to set them up for the testcases
+	// after this test we restore the initial args
+	oldArgs := os.Args
+	defer func() { os.Args = oldArgs }()
+
+	cases := []struct {
+		Name           string
+		Args           []string
+		ExpectedExit   int
+		ExpectedOutput string
+	}{
+		{"No flags",
+			[]string{"testdata/first"},
+			0,
+			"alabama barcelona\nbarcelona california\ncalifornia denver\ncalifornia denver\nамур брянск\nбелгород волгоград\nволгоград геленджик",
+		},
+		{"Reverse",
+			[]string{"-r", "testdata/first"},
+			0,
+			"волгоград геленджик\nбелгород волгоград\nамур брянск\ncalifornia denver\ncalifornia denver\nbarcelona california\nalabama barcelona",
+		},
+		{"Unique",
+			[]string{"-u", "testdata/first"},
+			0,
+			"alabama barcelona\nbarcelona california\ncalifornia denver\nамур брянск\nбелгород волгоград\nволгоград геленджик",
+		},
+		{"Column 2",
+			[]string{"-k=2", "testdata/first"},
+			0,
+			"alabama barcelona\nbarcelona california\ncalifornia denver\ncalifornia denver\nамур брянск\nбелгород волгоград\nволгоград геленджик",
+		},
+	}
+
+	for _, tc := range cases {
+		tc := tc
+
+		t.Run(tc.Name, func(t *testing.T) {
+			// this call is required because otherwise flags panics, if args are set between flag.Parse calls
+			flag.CommandLine = flag.NewFlagSet(tc.Name, flag.ExitOnError)
+			// we need a value to set Args[0] to, cause flag begins parsing at Args[1]
+			os.Args = append([]string{tc.Name}, tc.Args...)
+
+			assert.Equal(t, tc.ExpectedOutput, strings.Trim(run(), "\n"))
+		})
+	}
+}

sort-cli/testdata/first

@@ -0,0 +1,7 @@
+волгоград геленджик
+амур брянск
+alabama barcelona
+california denver
+california denver
+barcelona california
+белгород волгоград